XblAchievementsManagerAddLocalUser

HRESULT XblAchievementsManagerAddLocalUser(  
         XblUserHandle user,  
         XTaskQueueHandle queue  
)  

HRESULT hr = XblAchievementsManagerUpdateAchievement(xuid, "2", 3);
if (FAILED(hr))
{
    XAsyncBlock async{};
    hr = XblAchievementsUpdateAchievementAsync(m_xblContext, xuid, "2", 3, &async);
    if (SUCCEEDED(hr))
    {
        // this simple example is thread blocking. 
        // replace with whatever async pattern used by other XAsync calls in title
        XAsyncGetStatus(&async, true); 
    }
}